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Abstract

This transistor switching regulator (TSR) has a starting and control circuit that stores sufficient energy in a capacitor to provide full power to the controls and power transistor for start-up while meeting See Original the additional regulation requirement to limit the rise of this voltage and consequent damage to the control circuits.

Country

United States

Language

English (United States)

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Transistor Switching Regulator Starting and Monitoring

This transistor switching regulator (TSR) has a starting and control circuit
that stores sufficient energy in a capacitor to provide full power to the controls
and power transistor for start-up while meeting See Original the additional
regulation requirement to limit the rise of this voltage and consequent damage to
the control circuits.

The system is shown in block diagram form in Fig. 1. Fig. 2 defines the
functions and the relative levels ("Limit Voltage", "Reset Point", etc.) of V(C) at
which they occur. The capacitor C(C) is charged from the line via CR1 and R(1).
The Hysteresis Switch 10, Protect Latch 12, and associated circuit functions
draw their operating power from the voltage V(C), and load that voltage with
current I(CH). By design, I(CH) is smaller than I(CR1), such that capacitor C(C)(
will charge toward the peak of the line voltage. The control circuits, and in
particular the transistor drivers, require large currents which would be expensive
to obtain from the line directly; therefore, capacitor C(C) is charged with a very
light current I(CR1). Capacitor C(C) stores sufficient energy to supply these
larger currents.

Since neither I(CH) nor I(CR1) is particularly stable, V(C) could charge to a
limit voltage approaching the peak of the input line voltage, resulting in damage
to the control circuits. Therefore, a system is provided to roughly regulate V(C)
between the maximum tolerable voltage and a minimum voltage required for full
operation of the circuitry.

Switch 10 operates to turn on transistor T(1) when V(C) reaches the Turn On
Point (defined in Fig. 2) and also to turn off transistor T(1) when V(C) drops to the
Undervoltage. When switch 10 shuts off, that is, when T(1) is turned off, switch
10 also inhibits the pulsing of power Transistor T(2) and causes the latch 12
function to be set. Latch 12 is also set when V(C) climbs to the Overvoltage
point. Latch 12 being set will inhibit circuit...